Site-Specific Relationships between Bedrock Depth and HVSR Fundamental Resonance Frequency Using KiK-NET Data from Japan

Thabet, Mostafa

doi:10.1007/s00024-019-02256-7

Cited by 38 publications

(23 citation statements)

References 28 publications

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“…Fulfilling Bard and SESAME team (2004) surveys. In this study, ℎ is estimated at each KiK-net and K-NET site according to the adopted approach by Thabet (2019). The seismic impedance contrasts of and between each adjacent two layers are calculated using equation 9 and 10, respectively.…”

Section: Methods Of Analysesmentioning

confidence: 99%

“…This implied that linear behaviour is prevailing avoiding later modification due to nonlinear response. This enormous earthquake database for each KiK-net and K-NET site is prepared using multiple earthquakes approach (Thabet, 2019), and is simply assuming several consequent earthquakes records as a continuous time series to lengthen the total time window of each record. Between each two adjacent earthquake records, the effect due to conjunction points is negligible because the frequencies of interest are low (i.e.…”

Section: Data Setmentioning

confidence: 99%

“…In the literature, previous existing relationships of versus ℎ based on HVSR calculations of microtremor measurements were established by Ibs-von Seth and Wohlenberg (1999), Delgado et al 2000(a and b), Parolai et al (2002), Scherbaum et al (2003), Hinzen et al (2004), García -Jerez et al (2006), D'Amico et al (2008, Harutoonian et al (2013), Tün et al (2016) and Moon et al, (2019). Thabet (2019) established relationships of versus ℎ based on HVSR calculations of earthquake database of KiK-net. It is important to mention that all these statistical nonlinear regression relationships are strongly site-specific.…”

Section: Introductionmentioning

confidence: 99%

“…Strong scattering is dominated in the relationships of ℎ versus at bedrock depths of < 30 m and 30 ~ 100 m, although the HVSR frequency peaks are clear, unique, and sharp. Some KiK-net sites are excluded from the study conducted by Thabet (2019) because they are exhibiting strong nonstationary and undergo high scattering and perturbations in their resulted HVSRs.…”

Section: Introductionmentioning

confidence: 99%

“…According to Thabet (2019), there are 192 out of the accepted 324 KiK-net sites having their bedrock depths < 20 m, which corresponds to 59.3%. This means that bedrock depths < 20 m are strong responsible for the strong scattering that is dominated in the relationships of ℎ versus at bedrock depths of < 30 m and 30 ~ 100 m (Thabet, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Improved Site-dependent Statistical Relationships of Vs, Vp, and Resonant Frequency versus Bedrock Depth in Japan

Thabet

2021

Preprint

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Combining both processing techniques of horizontal-to-vertical spectral ratio (HVSR) and surface-to-borehole spectral ratio (SBR), using the KiK-net and K-NET database in Japan, could be used in the present study to establish relationships of Vs, Vp, and resonant frequency (f) versus depth to bedrock half-space (h) based on the site-dependent variability in different lithologies. Remarkable correlations of the average Vs and Vp of layers overlying the bedrock half-space (i.e. Vs and Vp) versus h are inversely resembling the relationships of f versus h and their maxima of ≤ 1000 m/s and ≤ 3000 m/s, respectively. Moreover, their ranges are decreasing gradually through site class of B, C, D and E resembling the ranges of the Vs30 according to NEHRP Provision (2000). Underestimation in the correlation coefficients resulted from HVSR at K-NET sites due to shallow and limited ranges of h whenever compared with those resulted from HVSR and SBR at KiK-net sites. Rebuilding the f versus h based on site-dependent variability in different lithologies could strongly decrease scattering and deviations of data points. Although such relationships are site-specific and highly dependent on each region’s geologic conditions, fair comparisons based on site information and site-dependent variability of different bedrock lithologies between previous relationships of f versus h in the literature and the present study relationships are showing remarkable and reasonable similarities. This indicates significant importance of introducing the seismic site classification of different lithologies as a crucial controlling factor in establishing the previous and the present nonlinear regression relationships.

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Section: Methods Of Analysesmentioning

confidence: 99%

Section: Data Setmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improved Site-dependent Statistical Relationships of Vs, Vp, and Resonant Frequency versus Bedrock Depth in Japan

Thabet

2021

Preprint

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Characterization of strong‐motion recording sites in the Himalayas and adjoining areas

Gupta

Kumari

2023

Earthquake Engineering and Resilience

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In this paper, an attempt has been made to arrive at sufficiently realistic estimates of the average shear-wave velocity in the top 30 m of the ground (V S30 ) for 200 strong motion recording sites spread over the Himalayas, adjoining Indo-Gangetic plains and northeast Indian regions. This is achieved by extending the application of the horizontal to vertical spectral ratio (HVSR) method for the strong motion recording sites with a limited number of records. The knowledge of surface geology at the recording sites and the V S30 estimates based on the topographic slope method has been utilized as supplementary information to arrive at a good first-order approximation of V S30 for the sites with a single record also. A total of 669 three-component acceleration records have been obtained at the 200 sites considered from 158 different earthquakes in the magnitude range of 2.3-7.9 during 1986-2015. It had not been possible to use this database fruitfully due to lack of the required site characterization. Compared to the costly and time-taking field studies required for the estimation of exact site-specific values, the proposed scheme can be considered to provide a convenient methodology for obtaining sufficiently reliable approximations of V S30 from the recorded strong motion data. The V S30 values obtained in this study are found to be in very good agreement with the site-specific experimental values available for 29 of the sites, establishing the validity of the proposed scheme. An alternative site characterization is also provided in terms of the site soil and the local geological conditions, both defined in terms of three categories specified by indicator variables with values of 0, 1 and 2. Lee and Trifunac have illustrated that this characterization has stronger correlation with the ground motion amplitudes than the V S30 as well as the NEHRP site classes based on broad intervals of V S30 . The site characterization of the 200 strong motion recording sites in the present study will find useful applications in developing region-specific empirical ground motion prediction equations with the site amplification effects modeled realistically and in selecting suitable equations from the published literature using score-based data-driven methods.

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Relationship between site resonance frequency and bedrock interface at one‐dimensional sites based on the KiK‐net database

Kong,

Rong,

et al. 2024

Earthquake Engineering and Resilience

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Site resonance frequency is a crucial parameter for estimating site effects. However, there is currently no consensus on how to identify the bedrock interface to obtain the site resonance frequency. In this study, we identified 43 stations that can be regarded as one‐dimensional sites from the KiK‐net network in Japan, which consists of 699 stations. By analyzing the horizontal‐to‐vertical spectral ratio and surface‐to‐borehole spectral ratio of strong motion observation recordings, the fundamental resonance frequency (f0) of these 43 sites was determined. Subsequently, the correlation between the f0 values obtained from theoretical noise horizontal‐to‐vertical spectral ratio (NHV) with different bedrock interfaces and the f0 values determined from observation was analyzed. The conclusion shows that the f0 is primarily influenced by shallow interfaces with high S‐wave impedance contrasts (ICs). Specifically, when the bedrock interface is taken as the interface with ICs greater than 2.5 that appears for the first time, or the interface with ICs greater than 1.5 that appears for the second time, there is a strong correlation (greater than 0.86) between the f0 values obtained from theoretical NHV and from observation. These findings can provide a quantitative reference for accurately determining the fundamental resonance frequency.

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Site-Specific Relationships between Bedrock Depth and HVSR Fundamental Resonance Frequency Using KiK-NET Data from Japan

Cited by 38 publications

References 28 publications

Improved Site-dependent Statistical Relationships of Vs, Vp, and Resonant Frequency versus Bedrock Depth in Japan

Improved Site-dependent Statistical Relationships of Vs, Vp, and Resonant Frequency versus Bedrock Depth in Japan

Characterization of strong‐motion recording sites in the Himalayas and adjoining areas

Relationship between site resonance frequency and bedrock interface at one‐dimensional sites based on the KiK‐net database

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